The phrase "a large force in" is correct and usable in written English.
It can be used to describe a significant influence or impact that someone or something has in a particular area or context.
Example: "The organization has become a large force in the fight against climate change, advocating for sustainable practices worldwide."
Alternatives: "a major player in" or "a significant influence in".
The National Children's Orchestra (NCO) has remained a large force in my life.
His resignation prompted accusations that the White House had punished dissenting views about maintaining a large force in Iraq.
The Republican governors were a large force in the president's election in 2000 and would be in 2004.
Assyria, unable to maintain a large force in Egypt, supported several delta vassal princes, including the powerful Psamtik I of Sais.
The Turks had amassed a large force in Medina, and the British leadership wanted Lawrence to gather the Arabs and destroy the Turkish garrison there, before the Turks could threaten the entire region.
That should have ended the matter, but instead the next day Sherman took a large force in pursuit until he ran into a man — Nathan Bedford Forrest — with whose name he would become well acquainted as the war progressed.
In these meetings, General Franks reviewed options including one in which a military operation using about 250,000 troops, with an initial invasion force of fewer than 100,000 troops and a larger force in reserve.
Caesar invaded first in 55 BC, and returned with a larger force in 54BC, fighting several skirmishes and battles, including one near a site where the city of Canterbury now lies.
"When the marines came into the west they brought a larger force in than the one that they replaced," General Sattler said, declining to specify the increase on the border except to say it was more than one-third larger than the numbers of forces the Army's 82nd Airborne Division put there.
Because of the shortage of matériel, there would not be much chance of putting a larger force in the field by that time even if this country should become involved in the war in the interim, but if that should happen, more men probably would be called up immediately for training, to be ready to form new divisions as matériel became available.
Online learning long ago solved the access problem: Between the 8 million people who have signed up for MOOCs, and the more than 1 billion downloads from Apple's iTunesU (Apple is quietly a larger force in online education than any upstart), we already know people want to take online courses.
